The Shimano CL800 Rotor is a great addition to your braking performance when you want to take on a range of terrain. This rotor features an external spline and 180mm diameter. It is ready to provide powerful and silent braking performance on or off the road. Thanks to excellent heat dissipation with Ice Freeza Technology, it is the kind of rotor you can count on during a long technical descent. As part of the Shimano GRX series, you can count on the best braking regardless of where you ride.